diff --git a/src/gdb-jit.h b/src/gdb-jit.h
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+// Copyright 2010 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef V8_GDB_JIT_H_
+#define V8_GDB_JIT_H_
+
+//
+// Basic implementation of GDB JIT Interface client.
+// GBD JIT Interface is supported in GDB 7.0 and above.
+// Currently on x64 and ia32 architectures and Linux OS are supported.
+//
+
+#ifdef ENABLE_GDB_JIT_INTERFACE
+#include "v8.h"
+#include "factory.h"
+
+namespace v8 {
+namespace internal {
+
+#define CODE_TAGS_LIST(V)                       \
+  V(LOAD_IC)                                    \
+  V(KEYED_LOAD_IC)                              \
+  V(STORE_IC)                                   \
+  V(KEYED_STORE_IC)                             \
+  V(CALL_IC)                                    \
+  V(CALL_INITIALIZE)                            \
+  V(CALL_PRE_MONOMORPHIC)                       \
+  V(CALL_NORMAL)                                \
+  V(CALL_MEGAMORPHIC)                           \
+  V(CALL_MISS)                                  \
+  V(STUB)                                       \
+  V(BUILTIN)                                    \
+  V(SCRIPT)                                     \
+  V(EVAL)
+
+class GDBJITLineInfo : public Malloced {
+ public:
+  GDBJITLineInfo()
+      : pc_info_(10) { }
+
+  void SetPosition(intptr_t pc, int pos, bool is_statement) {
+    AddPCInfo(PCInfo(pc, pos, is_statement));
+  }
+
+  struct PCInfo {
+    PCInfo(intptr_t pc, int pos, bool is_statement)
+        : pc_(pc), pos_(pos), is_statement_(is_statement) { }
+
+    intptr_t pc_;
+    int pos_;
+    bool is_statement_;
+  };
+
+  List<PCInfo>* pc_info() {
+    return &pc_info_;
+  }
+
+ private:
+  void AddPCInfo(const PCInfo& pc_info) {
+    pc_info_.Add(pc_info);
+  }
+
+  List<PCInfo> pc_info_;
+};
+
+
+class GDBJITInterface: public AllStatic {
+ public:
+  enum CodeTag {
+#define V(x) x,
+    CODE_TAGS_LIST(V)
+#undef V
+    TAG_COUNT
+  };
+
+  static const char* Tag2String(CodeTag tag) {
+    switch (tag) {
+#define V(x) case x: return #x;
+      CODE_TAGS_LIST(V)
+#undef V
+      default:
+        return NULL;
+    }
+  }
+
+  static void AddCode(const char* name,
+                      Code* code,
+                      Script* script = NULL);
+
+  static void AddCode(Handle<String> name,
+                      Handle<Script> script,
+                      Handle<Code> code);
+
+  static void AddCode(CodeTag tag, String* name, Code* code);
+
+  static void AddCode(CodeTag tag, const char* name, Code* code);
+
+  static void AddCode(CodeTag tag, Code* code);
+
+  static void RemoveCode(Code* code);
+
+  static void RegisterDetailedLineInfo(Code* code, GDBJITLineInfo* line_info);
+};
+
+#define GDBJIT(action) GDBJITInterface::action
+
+} }   // namespace v8::internal
+#else
+#define GDBJIT(action) ((void) 0)
+#endif
+
+#endif